drivers/net: const-ify ethtool_ops declarations

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/sunhme.c b/drivers/net/sunhme.c
index 6779ac1..2ff0ded 100644
--- a/drivers/net/sunhme.c
+++ b/drivers/net/sunhme.c
@@ -2512,7 +2512,7 @@
 	return (hp->sw_bmsr & BMSR_LSTATUS);
 }
 
-static struct ethtool_ops hme_ethtool_ops = {
+static const struct ethtool_ops hme_ethtool_ops = {
 	.get_settings		= hme_get_settings,
 	.set_settings		= hme_set_settings,
 	.get_drvinfo		= hme_get_drvinfo,